This report will review the most promising material for thermoelectric application (thermoelectric refrigerator and
thermoelectric generator). Here we are concerned on the material selection with emphasizing on their structure in order to achieve
high thermoelectric figure of merit. Four kinds of material
structure with Phonon Glass Electron Crystal (PGEC) approach
are highlighted here, those are skutterudite structure, clathrate
structure, half – Heusler structure and chalcogenide phase. They
are established materials for thermoelectric and intensively
studied by many researchers related to thermoelectric area.